I am trying to configure an outbound channel to send the payload (xml) as an attachment to an email address. I have the following configuration and when tested, the transport failed with an error "Transport error: [IPT_MsgCannotBeSent] SMTP message cannot be sent."
Email system is Lotus Notes.

Supplemental Detail Message Transmission Transport Exception
Transport Error Code is OTA-SMTP-1000
StackTrace oracle.tip.b2b.transport.TransportException: [IPT_MsgCannotBeSent] SMTP message cannot be sent.
at oracle.tip.b2b.transport.TransportException.create(TransportException.java:93)
at oracle.tip.b2b.transport.basic.SMTPSender.send(SMTPSender.java:628)
at oracle.tip.b2b.transport.b2b.B2BTransport.send(B2BTransport.java:316)
at oracle.tip.b2b.transport.TransportInterface.send(TransportInterface.java:1560)
at oracle.tip.b2b.msgproc.Request.requestRetry(Request.java:3172)
at oracle.tip.b2b.engine.Engine.messageRetry(Engine.java:4914)
at oracle.tip.b2b.engine.Engine.handleTimeoutEvent(Engine.java:4474)
at oracle.tip.b2b.engine.Engine.processEvents(Engine.java:3303)
at oracle.tip.b2b.scheduler.TimeoutEventHandler.execute(TimeoutEventHandler.java:107)
at oracle.integration.platform.blocks.scheduler.ScheduledJob.execute(ScheduledJob.java:137)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at oracle.integration.platform.blocks.executor.WorkManagerExecutor$1.run(WorkManagerExecutor.java:120)
at weblogic.work.j2ee.J2EEWorkManager$WorkWithListener.run(J2EEWorkManager.java:183)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:207)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:176)
Caused by: javax.mail.internet.ParseException
at javax.mail.internet.ContentType.<init>(ContentType.java:96)
at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1291)
at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1030)
at javax.mail.internet.MimeMultipart.updateHeaders(MimeMultipart.java:416)
at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1307)
at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2074)
at oracle.tip.b2b.transport.basic.SMTPSender$1.updateHeaders(SMTPSender.java:218)
at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2042)
at oracle.tip.b2b.transport.basic.SMTPSender.send(SMTPSender.java:592)
at oracle.tip.b2b.transport.b2b.B2BTransport.send(B2BTransport.java:316)
at oracle.tip.b2b.transport.TransportInterface.send(TransportInterface.java:1560)
at oracle.tip.b2b.msgproc.Request.requestRetry(Request.java:3172)
at oracle.tip.b2b.engine.Engine.messageRetry(Engine.java:4914)
at oracle.tip.b2b.engine.Engine.handleTimeoutEvent(Engine.java:4474)
at oracle.tip.b2b.engine.Engine.processEvents(Engine.java:3303)
at oracle.tip.b2b.scheduler.TimeoutEventHandler.execute(TimeoutEventHandler.java:107)
at oracle.integration.platform.blocks.scheduler.ScheduledJob.execute(ScheduledJob.java:137)
at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
... 4 more

Could someone help me interpret this message to find where is the problem.
Thanks,
Venkatesh